JPH04258497A - Outside lining work for primary lining work of shield tunnel - Google Patents

Abstract

PURPOSE:To economically form a lining work having high safeness in a short time by a simplified method for the inner lining work of shield tunnel. CONSTITUTION:An inner cylinder 11 is set doubly on the inside of the shield cylinder 10 of a shield excavator, and a movable partition wall 15 is provided between both the cylinders 10 and 11 in enabling it to move back and forth by an oil-pressure cylinder 16. The back side of the wall 15 is worked to be a backing material-storing chamber 13, and the chamber 13 is packed with a backing material 23 in advance. During the time when the chamber 13 advances as the excavation by the cylinder 11 proceeds, the wall 15 is moved backwards to push out the backing material 23.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary lining outer lining device for a shield tunnel, which fills the outside of the primary lining made of segments with a backing material when constructing a shield tunnel using a shield tunneling machine.

0002

[Prior Art] Conventionally, the lining of a shield tunnel has been carried out by assembling segments into a cylindrical shape within the rear end of the shield tube and pushing this segment backward during propulsion, as the tunnel is excavated by a shield tunneling machine. In addition to gradually extending the excavation work, backfilling material is being injected between the ground and the primary lining after excavation with a shield excavator.

[0003] In the conventional method of injecting backfilling material, an injection hole is opened through the segment in advance, the shield excavator is propelled a certain length, and then a hose is connected to this injection hole to insert the backfill material. The filling material was press-fitted.

[0004] In addition, conventional injection of backfilling material is only for filling the gap equal to the thickness of the shield cylinder formed between the outer surface of the primary lining made of segments and the ground surface, and in many cases On the inside of the primary lining, a secondary lining is applied for purposes such as waterproofing, rust prevention, anti-vibration, and smoothing of the inner surface (finishing).

[0005]

The conventional lining described above has the following problems.

(1) When a shield tunnel is completed, the function of backfilling and secondary lining is generally not as a stress member that receives external pressure, but as long as it is smooth, has water-stopping properties, and has a rust-preventing effect, thickness is required. However, due to the workability of cast-in-place concrete, it must be at least several tens of centimeters thick.

[0007] Therefore, in order to ensure the thickness of the secondary lining, an extra cross section must be excavated using a shield excavator.

(2) Since the cross section of the primary lining increases by the thickness of the secondary lining, which is not a stress member, the design of the primary lining segment becomes excessive.

(3) In shield tunnels, it is difficult to perform primary and secondary lining in parallel in a narrow tunnel;
The secondary lining is constructed after the primary lining is completed, which requires a very long construction period.

(4) On the other hand, there are shield tunnels in which the secondary lining is omitted and the cross section is completed with only the primary lining, but because the thickness of the lining material is small, water stoppage and rust prevention are not perfect. , adverse effects may appear in the mine.

(5) In addition, since the shield excavator is propelled by leaving a gap on the outer surface of the primary lining, and this gap is then filled with backfilling material, the ground is removed before filling with the backfilling material. It may collapse and become unstable, and uneven external forces may be applied to the primary lining.

In view of the above-mentioned conventional problems, the present invention provides a primary lining for a shield tunnel, which eliminates the need for a secondary lining and allows for rapid and economical excavation and lining of a shield tunnel. The purpose is to provide outer lining equipment.

[0013]

[Means for Accomplishing the Problems] The gist of the present invention in order to solve the above-mentioned conventional problems and achieve the intended purpose is to provide a shield tube inside the rear end of the shield tube of a shield tunneling machine. An annular backfill material storage chamber with an open rear end side is provided along the inner surface of the backfill material storage chamber, a backfill material injection hose is communicated with the backfill material storage chamber, and the backfill material in the chamber is directed to the rear side. An extrusion mechanism for extruding is provided, a segment assembly section is provided at the center side of the shield cylinder of the chamber,
A primary lining outer covering for a shield tunnel, which is configured to extrude and fill a backing material in the chamber into a gap between the outer surface of the primary lining formed by the advancement of the chamber and the surface of the tunnel ground. Exists in engineering equipment

[0014].

[Operation] The shield tunnel primary lining outer lining device of the present invention extends the primary lining by assembling segments on the center side of the backfilling material storage chamber. Thereafter, a reaction force is applied to the front end of the primary lining, and the entire shield excavator is made to excavate using a hydraulic jack for propulsion. During this excavation or as a result of the subsequent advancement of the backfill material storage chamber, a gap that is slightly larger than the thickness of the chamber and the shield tube will be formed at the rear of the backfill material storage chamber that has moved forward. Simultaneously with the advancement of the chamber, the backing material stored in the chamber is extruded and filled by an extrusion mechanism.

[0015] In this way, after advancing the backing material storage chamber by a certain length and pushing out the backing material at the same time, the extrusion mechanism in the chamber is returned to its original state and the backing material is stored in the chamber. to prepare for the next extrusion.

[0016]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, 10 is a shield tube of a shield tunneling machine. Although not shown in the figure, this shield excavator is equipped with an excavation mechanism such as a shield cutter and an earth removal mechanism such as a screw conveyor on its front end side.

At the rear end of the shield cylinder 10, an inner cylinder 11 is provided inside thereof in the form of a double cylinder arranged concentrically. Both cylinders 1
The front side between 0 and 11 is closed by an end wall 12, and the rear end side is opened in a ring shape, and the inside becomes a backfill material storage chamber 13. The end wall 12 has a backfill material supply pipe 14.
, 14... are inserted freely in and out.

Inside the chamber 13, there is housed a backfilling material extrusion mechanism consisting of a ring-shaped movable partition wall 15 and a number of hydraulic cylinders 16, 16, . The tips of the backfilling material supply pipes 14, 14... are fixed to the movable partition wall 15, and the movable partition wall 15
It is opened on the rear side.

The inside of the inner cylinder 11 is a segment assembly part 18, and a tail packing 19 is fixed to the inner surface of the rear end, and a primary lining 21 made of segments 20, 20, etc. is pressed into contact with the inside of the tail packing 19. It has become.

Propulsion shield jacks 22, 22, . It is designed to make the entire shield excavator dig.

Although not shown in the figure, the backfilling material supply pipes 14, 14... are made of cement milk, mortar, etc. as the main material, which hardens over time, and has self-hardening properties with high water stop properties after hardening. The cement-based outer lining material is pumped in.

Next, the lining method using the above device will be explained. First, as shown in FIG. 3(A), the hydraulic cylinder 16 is retracted to move the movable bulkhead 15 forward and expand the inside of the chamber 13. At the same time, the backfill material 23 is fed into the chamber 13 from the backfill material supply pipe 14 and stored. On the other hand, inside the inner cylinder 11, the segments 20 are assembled in parallel with the backfilling material storage work, and the previously constructed primary lining 21 is extended. Next, as shown in FIG. 3(B), the shield jack 22 is extended by taking a reaction force at the tip of the extended primary lining 21, thereby causing the shield excavator to dig, and at the same time pushing the primary lining backward. At this time, a gap will be formed at the rear of the chamber 13, but at the same time as the chamber 13 moves forward, the movable bulkhead 15 is moved rearward by the hydraulic cylinder 16, and the backfill that has been stored in the chamber 13 is The material 23 is pushed out backwards to fill the void. As a result, an outer lining 24 having the same thickness as the gap is integrally formed between the outer surface of the primary lining 21 and the ground surface 25. Then, after propelling it a certain length and filling the backfilling material, as shown in FIG.
3 is stored and the shield jack 22 is retracted to assemble the segments.

[0024] By using segments 20 for the primary lining 21 whose inner surfaces are finished smoothly, the inner surface finishing work after the lining construction is omitted.

In the above embodiment, the backfilling material storage chamber 13 is provided integrally with the shield cylinder 10, but in addition to this, as shown in FIG. A backfilling material storage chamber 13 is provided integrally with the spreader 30, and when the shield excavator excavates, it is pushed backward together with the primary lining 21, and when the chamber 13 is moved forward with the subsequent advancement of the jack spreader 30, the backfilling material is stored at the rear. You may also push it out.

[0026]

[Effects of the Invention] As described above, the lining device of the present invention is provided with a backing material storage chamber inside the rear end of the shield tube,
By making the inside part the segment assembly part, the primary lining of the segments is pushed out, and as the chamber is advanced, a gap for the outer lining is formed according to the thickness of the chamber, and this gap The outer lining is formed integrally with the primary lining by extruding the backing material inside the chamber at the same time as the void is formed, eliminating the need for a secondary lining on the inner surface of the primary lining. This greatly simplified the work and shortened the construction period.

Furthermore, since the inner surface of the primary lining made of segments can be used as the finished inner surface of the tunnel, the diameter may be smaller than that of the primary lining for which a secondary lining is planned.
For this reason, it is possible to provide leeway in the design of the segments, and there is no need to use a large tail seal.

Furthermore, instead of the secondary lining cast on site, an outer lining will be formed using the primary lining made of segments as a form, so the thickness of the entire lining will be reduced only by the stress. Since the thickness can be made close to that of the conventional method, the cross section of tunnel excavation can be made smaller than that of conventional methods, making it highly economical.

Furthermore, by storing the backing material in advance in the backing material storage chamber and extruding it from the open rear end of the chamber, a large amount of backing material can be extruded in a short period of time. This makes it possible to perform complete construction while preventing loosening of the tunnel ground surface even when a thick outer surface coating gap is formed.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing an example of a shield tunnel primary lining outer lining device according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG. 1.

FIG. 3 is a sectional view of main parts showing the lining process.

FIG. 4 is a sectional view of a main part of another example of the present invention.

[Explanation of symbols] 10 Shield tube 11 Inner cylinder 12 End wall 13 Backfill material storage chamber 14 Backfilling material supply pipe 15　Movable bulkhead 16 Hydraulic cylinder for extruding backing material 18 Segment assembly department 19 Tail packing 20 Segment 21 Primary lining 22 Shield jack 23 Backfill material 24 Outside lining 25 Land surface

Claims (1)

[Claims] Claim 1: An annular backfill material storage chamber with an open rear end side is provided along the inner surface of the shield tube in the rear end of the shield tube of the shield tunneling machine, and the backfill material is stored in the backfill material storage chamber. An extrusion mechanism is provided to connect the injection hose and push out the backing material in the chamber to the rear side, and a segment assembly part is provided at the center side of the shield cylinder of the chamber, and the primary covering by the segment formed by the advancement of the chamber is provided. A primary lining outer lining device for a shield tunnel, which extrudes and fills the backfilling material in the chamber into the gap between the outer surface of the tunnel and the surface of the tunnel ground.